Alexander Shen. Geometry in Problems. Volume 18 of MSRI Mathematical Circles Library, American Mathematical Society, 2016. [doi]
@book{0040371, title = {Geometry in Problems}, author = {Alexander Shen}, year = {2016}, url = {http://bookstore.ams.org/mcl-18/}, researchr = {https://researchr.org/publication/0040371}, cites = {0}, citedby = {0}, volume = {18}, series = {MSRI Mathematical Circles Library}, publisher = {American Mathematical Society}, isbn = {978-1-4704-3011-5}, }